I work at Mozilla, but I'm excited about this because I'm a web developer!
If you've ever tried to use flexbox to align content across multiple rows (like laying out a form with labels), you'd know that it's not a true two-dimensional layout tool. CSS Grid is, and will likely supplant flexbox as a flexbox is merely a one row/column grid.
The inspector is a pretty handy way to see what's going on under the hood, and being able to see the line numbers and named areas is great for visual debugging.
If you've ever tried to use flexbox to align content across multiple rows (like laying out a form with labels), you'd know that it's not a true two-dimensional layout tool. CSS Grid is, and will likely supplant flexbox as a flexbox is merely a one row/column grid.
The inspector is a pretty handy way to see what's going on under the hood, and being able to see the line numbers and named areas is great for visual debugging.